Where does this come from, and can I check it?

Tropical cyclone Denise dumped it on Réunion in 1966. The figure is taken from World Meteorological Organization, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

Is this really a records & extremes fact?

Yes. It sits on the Records & Extremes shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

What else can I read about it?

The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.

Mondo Knows Facts

The most rain in 24 hours was 1,825 millimetres

Tropical cyclone Denise dumped it on Réunion in 1966

Réunion, a volcanic island in the Indian Ocean, holds several rainfall records because its mountains force moist tropical air upward violently. On 7 and 8 January 1966, the gauges at Foc-Foc recorded 1,825 millimetres in 24 hours. That is more than London receives in three years.

Where this comes from

World Meteorological Organization

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Tags: rain, reunion, weather

The most rain in 24 hours was 1,825 millimetres: the short answers

Where does this come from, and can I check it?: Tropical cyclone Denise dumped it on Réunion in 1966. The figure is taken from World Meteorological Organization, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a records & extremes fact?: Yes. It sits on the Records & Extremes shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.